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G, J. LINB'BRG. vELEJHING DRUM.

No. 494,963. Patented Apr. v4, 1893..

Nrrno tartas CHARLES J. LINBERG, OF ST. LOUS, MISSOUR, ASSIGNOR TO THECONTI- NENTAL GAS STOVE COMPANY, OF SAME PLACE.

HEATING-DRUM.

SPECIFICATION forming part of Letters Patent No. 494,963, dated April 4,1893:

Application tiled March S, 1892. Serial No. 424,237- (No model.)

.To @ZZ whom it may concern:

Beit known that I, CHARLES J. LINBERG, a citizen of the United States,residing in the city of St. Louis, State of Missouri, have inventedcertain newr and useful Improvements in Heating-Drums, of which thefollowing is a specification.

My invention relates to improvements in heating drums and has for itsobjects to provide an extensive heating surface, and to secure rapidcirculation of the air and a con- Venientdraft regulation, and generallyto pro- Vide a more eiiicient and economical heating drum.

My invention consists of the construction herein described.

In the accompanying drawings forming part of this specification, Figure1 is a vertical central section of the drum, along the line 1-l. Fig. 2is a horizontal section along the line 2-2 ot' Fig. 1.

The air box is made of annular end pieces l, 1, connected together attheir outer rims by a cylindrical shell 2, and each provided with ahemispherical piece, 3, secured to the inner edge thereof so as toextend into the interiorot the cylindrical shell 2. Circular end plates,4, e, connected together at their outer rims by a cylinder, 5,constitute the smoke box, within which the air box above described isinclosed, concent'rically. The circular end plates, 4,4, are providedwith openings, 6, and the annular end plates 1, 1, are provided withopenings, 6. The openings, G, in each circular end plate, 4, arearranged to register with the openings, 6', in the corresponding annularend plate, l, and circular ribs, 7, are provided around each opening.Short tubes or thimbles, 8, held in position by these ribs, connect thetwo pairs of end.

plates and form passages from the air chamber to the outside air. Theparts are held in place by ordinary stove belts, 9, which pass throughthe smoke chamber and clamp the circular end plates together. Thecircular end plates are provided with openings in the center, to whichsmoke pipe sections, 10, 11, connect respectively. Said pipe section 10extends through the opening in the correspending end plate nearly to thehemispherical portion of the air box, but for the .purposes of draftregulation, it is preferable to make these sections, or one of them adjestable. As shown in the drawings, the section, 11, proper terminates atthe end plate, 4, and a separate joint ot' pipe, 12, of smaller diameterthan the section, ll, and telescoping therewith, extends into the smokechamber. Any suitable means of fastening the telescoping section inposition may be used, as for instance, a bolt, 13, fast to thetelescoping section. This bolt passing through alongitudinal slot, 14,inthe pipe section l1, and a clamping nut, 15, screwing on the endthereof, permit easy adjustment of the section. The like arrangement maybe adopted for the'sectiou,10. A cylindrical casing, 16, surrounds thesmoke cylinder, 5, at a slight distance therefrom.

The operation of the device is as follows: The drum is supported by thepipe section, 10, in a vertical position, the telescoping pipejoint, 12,being at the top. The products of combustion passing through the smokepipe, l0, impinge against the under side of the hemispherical dome, orarched bottom, 3, are deflected downward passing under the lower annularring, 1, between the several short tubes or thimbles, S, thence passingthrough the narrow annular nue formed by the cylindrical casings of thesmoke chamber and the air chamber, thence between the upper tubes orthimbles, 8, thence to the lower end .of the telescoping section, 12,and into the smoke pipe, 11. The air in the air chamber is heated by theproducts of combustion and rises, issuing into the air of the roomthrough the upper tubes, 8, fresh air enters at the lower tubes, 8, totake its place, and the circulation` of air is established. The cool airentering at the lower tubesis heated by the products of combustion whichhave had part of their heat abstracted in the dome. The air thuspartially heated rises and is further heatedby the hotter products underthe upper portion of the dome. Enough heat is retained by the productsof combustion to insure a proper draft; while the annular ilue and theposition of the lower end of the exit section tend to equalize thetemperature of the products and the air. By lowering the telescopingsection,

12, into the bowl-shaped top of`the air chamber, the draft is checked;by raising the section, the draft is increased. The thin sheet of air inthe outer annular air passage receives heat from the partially exhaustedproducts of combustion as they rise in the annular flue; and circulationfollows.

The principal advantage of this drum is its symmetrical construction.Large heating areas are obtained in a small space; because the draft isapproximately equal at all points in the annular lues, whereby the Wholesurface of the flues is available for heating. The air is heated in thinsheets instead of in volume so that a rapid circulation is effected. Theend plates also are interchangeable. Thisheatingdrumissusceptibleofobviouschanges. For instance, a burner ot' anykind may replace the smoke pipe, 10, proper provision, of course, beingmade to supply air thereto and the drum being supported so as to admitthe air to the lower tubes.

1. A heating drum comprising an air-box having an arched bottom, a platewith holes therein connecting said arched bottom and the side of saidair-box, said air-box having an outlet for heated air, a smoke box,inclosing said air-box, and having holes therein, connecting the holesin said air box and said smoke box respectively, and a source of heatunder said arched bottom, substantially as described.

2. A heating drum consisting of a cylindrical air-box having an annularbottom plate with holes therein, an inwardly extending hemisphericalpiece for said annular plate, said airbox having an outlet for heatedair, a smoke box inclosing said air-box and having holes in its underside, and tubes connecting the holes in said bottom plates and the holesin the under side of said smoke box, substantially as described.

3. A heating drum consisting of a cylindrical air box having an archedbottom, and a bowl-shaped top, a cylindieal smoke box, a source ot heatclose under the arched bottom, and an open exit pipe above the lowerpart of the top of said air box.

4. A heating drum consisting of a cylindrical air box having an archedbottom, and a bowl-shaped top, a cylindrical smoke box, a source of heatclose under the arched bottom, and an adjustable exit pipe above thelower part of the top of said air box.

5. A heating drum having a cylindrical air box, annular end platestherefor having holes therein, and inwardly extending hemisphericalpieces for said annular plates, a cylindrical smoke box, inclosing saidair box, having holes in its end plates, tubes connecting the holes inadjacent end plates, a pipe extending through one end plate of the smokebox close to the corresponding hemispherical piece, and a pipeconnecting to an opening in the center of the other end plate ot' saidsmoke box.

CHARLES J. LINBERG.

Vitnesses:

CHARLES L. SHERWooD, J AMES A. CARR.

